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diff --git a/vcl/win/dtrans/globals.hxx b/vcl/win/dtrans/globals.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#pragma once
+
+#include <sal/config.h>
+
+#include <com/sun/star/uno/Reference.hxx>
+#include <osl/mutex.hxx>
+
+namespace com::sun::star::datatransfer
+{
+class XTransferable;
+}
+
+#include <wtypes.h>
+#include <sal/types.h>
+
+// This maps key states as occur as parameter, e.g. in IDropTarget::DragEnter,
+// IDropSource::QueryContinueDrag, to actions as are declared in
+// css::datatransfer::dnd::DNDConstants ( ACTION_MOVE etc).
+// If the grfKeyState indicates the ALt or right mousebutton then the returned
+// values combines all possible actions. This is because those keys and buttons are
+// used when the user expect a menu to appear when he drops. The menu then
+// contains entries, such as move, copy, link, cancel.
+// An odd fact is that the argument grfKeyState in IDropTarget::Drop does not
+// contain mouse buttons (winnt 4 SP6). That indicates that the right mouse button
+// is not considered relevant in a drag operation. Contrarily the file explorer
+// gives that button a special meaning: the user has to select the effect from
+// a context menu on drop.
+sal_Int8 dndOleKeysToAction(DWORD grfKeyState, sal_Int8 sourceActions);
+
+// The function maps a windows DROPEFFECTs to actions
+// ( css::datatransfer::dnd::DNDConstants).
+// The argument can be a combination of different DROPEFFECTS,
+// In that case the return value is also a combination of the
+// appropriate actions.
+sal_Int8 dndOleDropEffectsToActions(DWORD dwEffect);
+
+// The function maps actions ( css::datatransfer::dnd::DNDConstants)
+// to window DROPEFFECTs.
+// The argument can be a combination of different actions
+// In that case the return value is also a combination of the
+// appropriate DROPEFFECTS.
+DWORD dndActionsToDropEffects(sal_Int8 actions);
+
+// If the argument constitutes only one action then it is mapped to the
+// corresponding DROPEFFECT otherwise DROPEFFECT_MOVE is returned. This is
+// why move is the default effect (no modifiers pressed, or right mouse button
+// or Alt).
+DWORD dndActionsToSingleDropEffect(sal_Int8 actions);
+
+extern css::uno::Reference<css::datatransfer::XTransferable> g_XTransferable;
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */